Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| halide torch | device to detect gas leaks using the color
changes of a flame in the presence of a halogenated hydrocarbon |
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| halocarbon |
compound containing carbon, one or more
halogens, and sometimes hydrogen. Compare fluorocarbon |
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| halogen | one of the electronegative elements of Group VII
A of the periodic table of the elements (fluorine, chlorine, bromine, iodine,
and astatine); listed in the order of their chemical activity, fluorine being
the most active of all chemical elements. |
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| hard copy |
printed copy of machine output, e.g., printed
reports, listings, documents, and summaries. |
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| hard-wired |
1. in electronic circuits connected with wires. 2. method of programming a system to perform
specified functions through the use of wires (often patchboard styles, or, more
recently, readonly memory techniques) as opposed to a stored program or
software method |
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| hardening (quenching) | 1.
rapid cooling from specific temperatures of metallic products, particularly
steel, in order to increase hardness. 2. cooling the product from the ice cream
freezer in order to freeze most of the water not solidified in the freezer |
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| hardware |
parts such as fasteners, hinges, shovels, and
rakes. See also computer hardware. |
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| Hartford loop |
condensate return arrangement for low-pressure
steam-heating systems, featuring a constant waterline in the boiler. |
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| HCFC |
halocarbon that contains fluorine, chlorine,
carbon, and hydrogen. |
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| HDD |
heating degree-day. Degree-day for departure
below the base. See degree-day. |
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